/*
 * Type-safe wrapper for WebGL in GWT.
 * 
 * Copyright (C) 2009 Hao Nguyen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package gwt.g3d.test.client;

import gwt.g3d.client.shader.AbstractShader;
import gwt.g3d.client.shader.ShaderException;
import gwt.g3d.resources.client.ShaderResource;

import com.google.gwt.user.client.Window;

/**
 * Abstract class for all demos from 
 * <a href="http://learningwebgl.com/">http://learningwebgl.com</a>
 * 
 * @author hao1300@gmail.com
 */
public abstract class AbstractLessonDemo extends AbstractDemo {
  protected AbstractShader shader;
  
  protected AbstractLessonDemo(int lessonNumber) {
    super("Lesson " + lessonNumber, 
        "http://learningwebgl.com/lessons/lesson" 
        + (lessonNumber < 10 ? ("0" + lessonNumber) : lessonNumber)        
        + "/index.html");
  }
  
  @Override
  protected void initImpl() {
    try {
      ShaderResource shaderResource = ((ShaderResource) getClientBundle()
          .getResource("shader"));
      shader = shaderResource.createShader(gl);
      shader.bind();
    } catch (ShaderException e) {
      Window.alert(e.getMessage());
      return;
    }    
  }
}
